World Immunization Week 2026: How Do Countries Sustain Immunization Coverage?

Why It Matters

Sustaining immunization coverage is essential to prevent preventable disease outbreaks and protect global health security, especially as pandemics and conflicts strain health systems.

Key Takeaways

• COVID-19 caused global dip in routine immunization coverage across income levels.
• Gavi’s public‑private model boosted vaccine access in low‑income nations.
• Conflict zones like Sudan, Palestine, Ukraine see sharp coverage drops, then rebounds.
• US contributions average 14% of Gavi funding, facing recent political uncertainty.
• Targeted ceasefires and house‑to‑house campaigns improve vaccine reach during wars.

Summary

World Immunization Week 2026 highlighted the struggle to maintain vaccine coverage worldwide, as CSIS experts Priya Chainani and Dr. Katherine Bliss examined data on zero‑dose children, pandemic setbacks, and conflict‑driven gaps.

Their analysis shows that after the 2005 launch of Gavi, low‑ and lower‑middle‑income countries lifted DTP three‑dose coverage, but progress stalled after 2010 and fell sharply in 2020 when COVID‑19 disrupted supply chains, closed clinics and frightened parents. High‑income nations fared better, yet even they recorded modest declines.

Conflict further erodes access: in Sudan only about 39 % of health facilities remain functional, while cease‑fire‑driven campaigns in occupied Palestine and war‑time outreach in Ukraine have produced modest rebounds. The United States has contributed roughly 14 % of Gavi’s budget, but recent political debate threatens future funding.

The findings underscore that resilient immunization systems require coordinated public‑private financing, contingency plans for emergencies, and diplomatic tools such as cease‑fires to reach zero‑dose children. Without sustained investment, global disease resurgence remains a real threat.

Original Description

The resurgence of measles and other vaccine preventable diseases in the United States and elsewhere underscores the fragility of recent progress on disease prevention and points to the importance of reinforcing domestic and global efforts to prevent deadly, as well as costly, outbreaks and protect health security. Wars and civil conflicts can reduce the population’s access to health services, including immunizations, making children living in humanitarian or conflict settings especially vulnerable to vaccine-preventable diseases. Recent decisions by the United States to wind down bilateral immunization programs, terminate its support for Gavi, the Vaccine Alliance, which helps the lowest-income countries purchase vaccines, and to withdraw from the World Health Organization (WHO), which provides national immunization programs with technical support, may further limit progress.

For World Immunization Week 2026, Dr. Katherine Bliss, Director for Immunizations and Health Systems Resilience, and Senior Fellow with the CSIS Global Health Policy Center and Priya Chainani, Program Coordinator and Research Assistant with the CSIS Global Health Policy Center explore recent trends in global immunization coverage, including during the Covid-19 pandemic, and the role of the U.S. in maintaining global health security.

For detailed analysis on further global immunization trends, please view: https://www.csis.org/analysis/10-charts-explain-global-immunization-policy-where-united-states-stands

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